from __future__ import annotations

import unittest
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]


class PackagingTests(unittest.TestCase):
    def test_makefile_supports_src_layout(self) -> None:
        makefile = (ROOT / "Makefile").read_text(encoding="utf-8")
        self.assertIn("PYTHONPATH=src:.", makefile)

    def test_release_metadata_is_mpl_2_and_version_0_2(self) -> None:
        pyproject = (ROOT / "pyproject.toml").read_text(encoding="utf-8")
        self.assertIn('version = "0.2.0"', pyproject)
        self.assertIn('license = "MPL-2.0"', pyproject)
        license_text = (ROOT / "LICENSE").read_text(encoding="utf-8")
        self.assertIn("Mozilla Public License Version 2.0", license_text)
        debian_copyright = (ROOT / "debian/copyright").read_text(encoding="utf-8")
        self.assertIn("License: MPL-2.0", debian_copyright)

    def test_debian_dependency_is_exactly_1_14_0(self) -> None:
        control = (ROOT / "debian/control").read_text(encoding="utf-8")
        self.assertIn("sing-box (= 1.14.0)", control)

    def test_in_place_upgrade_is_rejected(self) -> None:
        preinst = (ROOT / "debian/preinst").read_text(encoding="utf-8")
        self.assertIn('[ "$1" = upgrade ]', preinst)
        self.assertIn("exit 1", preinst)

    def test_postinst_checks_for_legacy_state(self) -> None:
        postinst = (ROOT / "debian/postinst").read_text(encoding="utf-8")
        self.assertIn("vpn_egressctl.installcheck", postinst)

    def test_sing_box_drop_in_requires_guard(self) -> None:
        drop_in = ROOT / "packaging/systemd/sing-box.service.d/10-vpn-egress-guard.conf"
        text = drop_in.read_text(encoding="utf-8")
        self.assertIn("Requires=vpn-egress-guard.service", text)
        self.assertIn("After=vpn-egress-guard.service", text)

    def test_debian_package_installs_sing_box_drop_in(self) -> None:
        install = (ROOT / "debian/install").read_text(encoding="utf-8")
        self.assertIn(
            "packaging/systemd/sing-box.service.d/10-vpn-egress-guard.conf "
            "usr/lib/systemd/system/sing-box.service.d",
            install,
        )


if __name__ == "__main__":
    unittest.main()